na-adjective, noun
Literary, somewhat old-fashioned word for describing a person's character or behavior as contemptible, low, or despicable. Rare in modern conversation; more common synonyms include 卑劣 (ひれつ) or 下劣 (げれつ).
彼の陋劣な振る舞いに皆が呆れた。
Everyone was disgusted by his mean behavior.
その批評は陋劣極まりない内容だった。
The review was utterly base in content.